Is there any methods of “unyellowing” old beige PC parts?

Question

I have some (really) old PC parts that I would like to repurpose for fun. However the beige plastic on some of them has yellowed due to heat or sun exposure. Is there any way to restore them back to their beige glory?

Answer 1

Have a look at the retr0bright page.

“The problem was finally cracked in late July 2008 with a mixture of hydrogen peroxide, a small amount of an “Oxy” laundry booster as a catalyst and a UV lamp; we believed that this could do the job in hours instead of days. "

Forum support thread on AmiBay.

After and before:

Answer 2

Pencil eraser does this. It's a bit manual and takes a while (depending on the size of the eraser employed).

Using a pencil eraser, you can write frustrated messages to IT staff who have condemned you to labor on equipment old enough to still be beige/yellowed.